The processes of structure formation, mechanical and tribological properties under vacuum hot pressing of a blend of powders of iron, copper, nickel and tin with a dispersion of 5–50 µm with the addition of a nanopowder of vanadium nitride depending on temperature are described. It was found that an increase in sintering temperature from 800 to 1000°C leads to grinding of ferrite grains to 20–400 nm, the release of primary (d = 10–100 nm) and secondary (d ≤ 10 nm) VN grains and an increase in hardness from 3.75 to 5.37 GPa and H/E parameters from 0.021 to 0.043 and H³/E² from 1.70 to 9.91 MPa, a decrease in the elastic modulus from 176 to 125 GPa and a friction force from 250 to 180 mN, a decrease in speed wear from 8.15 × 10⁻⁴ to 1.79 × 10⁻⁴ mm³·N⁻¹·m⁻¹. The mechanism of grain refinement and the improvement of physical and mechanical properties is due to α → γ → α transformations occurring under conditions of VN dissolution in α-Fe and subsequent cooling.

中文翻译：

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含金刚石复合材料真空热压法制备Fe-Cu-Ni-Sn-VN纳米晶基体。机械和摩擦学性能

描述了在真空热压下铁，铜，镍和锡的粉末混合物（分散度为5–50 µm，并根据温度添加纳米粉末）的过程中形成结构，力学和摩擦学性能的过程。研究发现，烧结温度从800升高到1000°C，会导致铁素体晶粒磨削至20–400 nm，释放出初生（d = 10–100 nm）和次生（d≤10 nm）VN晶粒，硬度从3.75 GPa升高至5.37 GPa，H / E参数从0.021升高至0.043，H ³ / E ²从1.70 MPa升高至9.91 MPa，弹性模量从176 GPa降低至125 GPa，摩擦力从250 mN降至180 mN ，速度磨损从8.15×10降低^-4至1.79×10 ^-4 mm ³ ·N ^-1 ·m ^-1。晶粒细化的机制以及物理和机械性能的改善是由于在VN溶解在α-Fe中并随后冷却的条件下发生了α→γ→α相变。